The key used in the back door will lock and unlock the four doors, but the back door remains locked.

 

It may be due to a faulty tailgate door lock actuator. The tailgate key cylinder switch is separate from the tailgate door lock actuator.

Unplug Connector C595. Apply direct 12 volt power (+) and ground (-) to the actuator motor wires to see if it operates.

• Unlock: Power (+) to terminal no. 4 cavity (Yel/Red wire) and Ground (-) to terminal no. 3 cavity (Wht/Red wire) momentarily.
• Lock: Power (+) to terminal no. 3 cavity (Wht/Red wire) and Ground (-) to terminal no. 4 cavity (Yel/Red wire) momentarily.

 

Has anyone rebuilt one of these. I have mine out, havent been able to find a replacement. When I bench test it the motor turns over but seems very weak. Not enough power to move the lock. The wheel that move the lock arm is spring loaded to a neutral position it would seem. Is this correct? Thanks in advance for any help.